How much does Postmark cost in 2026?
Postmark prices one thing: how many emails you send and receive in a month. There are no contacts, no seats to buy, no send multipliers and no annual commitment, the company does not offer annual billing at all. What there is instead is a three-plan structure sitting on a single volume ladder, and the difference between those three plans turns out to be a flat percentage rather than the small fixed sum the entry tier suggests.
The short version. A free Developer tier gives 100 emails a month forever. Paid plans start at $15/month for 10,000 emails on Basic, and there is nothing between those two numbers. Pro costs exactly 10% more than Basic at every volume, Platform exactly 20% more. Dedicated IPs start at $50/month and need both Pro and 300,000 emails a month. Figures are US dollars read from postmarkapp.com on 24 August 2026.
The volume ladder
Every figure below was read at its own slider position. The plan you pick does not change the volume you get; it changes the price of that volume and what the account can do structurally.
| Emails / month | Basic | Pro | Platform | Basic per 1,000 |
|---|---|---|---|---|
| 100 (Free) | $0 | – | – | – |
| 10,000 | $15.00 | $16.50 | $18.00 | $1.50 |
| 50,000 | $55.00 | $60.50 | $66.00 | $1.10 |
| 125,000 | $115.00 | $126.50 | $138.00 | $0.92 |
| 300,000 | $245.00 | $269.50 | $294.00 | $0.82 |
| 700,000 | $455.00 | $500.50 | $546.00 | $0.65 |
| 1,500,000 | $775.00 | $852.50 | $930.00 | $0.52 |
| Above that | the slider stops and says “Hey Big Sender!”, high-volume pricing is quoted by sales | |||
The curve is monotonic. Every step up improves the per-thousand rate, there is no cliff anywhere on the ladder, and the rate falls by two-thirds between the entry tier and 1.5 million emails. That is a cleaner shape than most of the platforms we have priced.
Pro is 10% more than Basic. Platform is 20%. At every single volume.
The plan cards at 10,000 emails read $15.00, $16.50 and $18.00, which invites an obvious conclusion: Pro costs a dollar fifty more than Basic, so of course you take Pro for the inbound processing and the extra domains.
That conclusion is only true at the bottom of the ladder. Across all six volumes we read, Pro is Basic multiplied by exactly 1.10 and Platform is Basic multiplied by exactly 1.20, to the cent. At 1.5 million emails, Pro is not $1.50 more than Basic, it is $77.50 more, and Platform is $155 more.
What to do with that. Decide between the three plans as a percentage question, not a dollar question. Is inbound processing, 365-day retention and ten domains worth adding 10% to your email bill forever? Is unlimited everything worth 20%? The answer does not change with volume, which makes the decision unusually easy once you stop reading the entry-tier prices as fixed sums.
Overages cost up to three times the in-plan rate
Every paid plan carries a published overage rate for emails beyond your tier, and it varies by plan and, slightly, by volume:
| Tier | Basic | Pro | Platform |
|---|---|---|---|
| 10,000-125,000 | $1.80 / 1,000 | $1.30 / 1,000 | $1.20 / 1,000 |
| 300,000-700,000 | $1.70 / 1,000 | $1.25 / 1,000 | $1.15 / 1,000 |
| 1,500,000 | $1.70 / 1,000 | $1.20 / 1,000 | $1.15 / 1,000 |
Now set those against what the same emails cost inside a plan. At the 10,000 tier, Basic charges $1.50 per thousand in-plan and $1.80 for overage, a 20% penalty, mild enough to ignore. At 1.5 million, Basic charges $0.52 per thousand in-plan and $1.70 for overage.
That is 3.3 times the in-plan rate, and the penalty grows as you scale. The bigger your tier, the worse it is to exceed it. A 1.5-million-email account that sends 1.7 million pays $775 for the first 1.5 million and $340 for the next 200,000, nearly half again as much money for 13% more email. Move up a tier before you need to, not after.
Two mechanical details soften this. Overages do not stop your sending: Postmark states they are “calculated at the end of your billing cycle and included with your plan cost for the upcoming month”, so you are billed in arrears rather than cut off. And the free Developer plan takes the opposite approach, “no overages allowed in this plan”, so the 100-email ceiling there is hard.
Unused emails do not roll over
Postmark’s FAQ is blunt about it: “No. If you are under your email limit at the end of a billing period, the unused emails do not roll over to the next billing period.”
Combined with the overage penalty above, this makes tier selection a real decision rather than a formality. Buy a tier well above your average and you throw away the difference every month. Buy one at your average and any spike costs up to 3.3 times the normal rate. For a business with seasonal or lumpy sending, neither option is comfortable, and Postmark has no credit-bank mechanism to smooth it out.
There is no annual plan, and that is not a criticism
Asked whether it offers annual plans, Postmark answers: “Not right now, but we’d like to! We’re looking at introducing annual plans, which can offer some flexibility to customers who have lower and/or seasonal volume.”
So every price on this page is a monthly price with no commitment behind it. There is no annual discount to chase and no twelve-month lock-in to negotiate out of. After pricing several platforms whose “annual saving” turns out to be a first-year promotion, or whose annual plan costs exactly the same as monthly, a vendor that simply does not offer one is refreshingly easy to compare.
The trade. You give up the 15-20% that annual billing buys elsewhere. You get the ability to leave in any month, and a price that means what it says. Note also the payment terms: Visa, MasterCard, American Express, Diners and JCB only-no PayPal and no purchase orders, which rules Postmark out for organisations that can only pay by invoice.
The gap between 100 and 10,000 emails
The free Developer plan gives 100 emails a month and, as Postmark puts it, “it doesn’t expire or run out”. It is a permanent integration-testing tier rather than a trial, which is the honest way to offer one.
But the next rung is 10,000 emails at $15, and Postmark confirms there is nothing in between: “We do not offer a tier between 100 emails/month (our free developer plan) and 10,000 emails/month.”
A hundredfold jump with nothing in the middle. A side project sending 400 password resets a month cannot buy 1,000 emails; it buys 10,000 for $15 and wastes 96% of them. That is not a large sum, but it is the single least efficient point on the ladder at $1.50 per thousand rising to an effective $37.50 per thousand actually used. The bootstrapper offer of $75 in credit that Postmark advertises covers five months of it.
The free plan is less restricted than the paid Basic plan
This is the oddity of Postmark’s pricing table, and it is right there in the feature comparison. On every structural limit, the free Developer tier is twice as generous as Basic:
| Limit | Free | Basic | Pro | Platform |
|---|---|---|---|---|
| Message streams | 30 | 15 | 30 | unlimited |
| Servers | 10 | 5 | 10 | unlimited |
| Custom sending domains | 10 | 5 | 10 | unlimited |
| Users | 6 | 4 | 6 | unlimited |
| Inbound email | yes | no | yes | yes |
Free matches Pro on every one of those rows and beats Basic on all of them, including inbound processing, which Basic does not have at all. The only thing Basic buys over Free is volume: 10,000 emails instead of 100.
What this means when you upgrade. A developer who builds against the free tier using three sending domains, two servers and inbound webhooks, then upgrades to Basic when the project goes live, is moving to a plan that still fits, but a slightly more elaborate setup will hit Basic’s ceilings on the day it starts paying. Pro at 10% more restores everything the free tier already gave you. Check your domain, server and stream counts against Basic’s limits before assuming the cheapest paid plan is a step up.
Dedicated IPs have two gates, not one
Dedicated IPs start at $50/month per IP, and Postmark attaches two independent conditions: they are “available to customers sending 300,000 emails per month or more” and “only available on Pro plans or higher“.
Both must be true. A Pro customer at 125,000 emails cannot buy one; nor can a Basic customer at a million. The practical entry point is therefore Pro at the 300,000 tier, $269.50 a month, plus $50, so $319.50 a month before you have a dedicated IP at all.
That is a deliberate deliverability policy rather than a pricing trick: a dedicated IP needs consistent volume to stay warm, and 300,000 a month is a defensible floor for that. But it does mean anyone who needs a dedicated IP on lower volume needs a different provider, and it is worth knowing before you migrate rather than after.
Retention is 45 days unless you pay for more
All four plans store full message content for 45 days by default. Pro and Platform can extend that to up to 365 days, and the mechanism is an add-on: custom activity retention starts at $5/month.
Basic cannot extend retention at any price. If you need message bodies older than 45 days, for support archaeology, dispute resolution or a compliance requirement, that is another reason the effective floor is Pro.
Marketing email is allowed, on separate infrastructure
Postmark is a transactional specialist, and its answer on bulk marketing is a qualified yes: “To comply with industry best practices and to maintain our high deliverability, it’s important though that transactional and marketing emails never mix. That’s why we created Message Streams, a parallel but completely separate sending infrastructure for your transactional and broadcast emails.”
Both kinds count against the same monthly volume and the same price ladder. There is no second meter and no second invoice, which is a simpler arrangement than platforms that split the two into separate products with separate free tiers.
But note the stream limits. Basic allows 15 streams, Pro 30, Platform unlimited, and your transactional and broadcast streams both draw on that pool. An agency running separate streams per client will meet Basic’s ceiling quickly, which is precisely the case Platform’s unlimited streams exist for.
Six things that catch people out
1. The plan gap is a percentage, not $1.50. Pro is always Basic plus 10%, Platform always plus 20%. At 1.5 million emails that is $77.50 and $155 a month.
2. Overages reach 3.3 times the in-plan rate. $0.52 per thousand inside a 1.5-million tier against $1.70 for anything beyond it, and the gap widens as you scale.
3. Nothing rolls over. Under-send and the difference is gone at the end of the month.
4. The free tier out-specs the Basic plan. Twice the streams, servers, domains and inbound processing. Upgrading to Basic can tighten your limits.
5. Dedicated IPs need Pro and 300,000 emails a month. Both conditions, not either. Effective floor $319.50 a month.
6. No PayPal, no purchase orders, no annual plans. Card only, monthly only. A blocker for organisations that pay by invoice.
Who Postmark is priced for
It is priced well for product teams sending transactional email at steady, predictable volume. The ladder is clean, the per-thousand rate falls consistently, there is no contact count to manage, no seat tax and no annual commitment. For a SaaS business sending 50,000 to 700,000 receipts and notifications a month, the pricing is straightforward to model and there are no surprises in it.
It is priced badly for anyone with spiky volume, because the combination of no rollover and a punitive overage rate charges you at both ends. It is also poor value below about 4,000 emails a month, where you are buying a 10,000-email tier and using a fraction of it, and it is unavailable to anyone who needs a dedicated IP without the volume to justify one.
On the plan choice. Basic exists mainly as a price anchor. It removes inbound email, halves every structural limit relative to the free tier, cannot extend retention and cannot have a dedicated IP. For 10% more, Pro restores all of it. Unless you are certain your setup is genuinely simple and will stay that way, Pro is the plan the product is actually designed around, which is presumably why Postmark labels it “Most Popular”.
How to size Postmark in four steps
- Count sends and receives together. The slider asks how many emails you “send and receive”, inbound processing draws on the same allowance, so include it if you use it.
- Pick the tier above your peak month, not your average. Unused emails do not roll over, but overage runs to three times the in-plan rate, and the asymmetry favours a little headroom. Model both against your own twelve-month volume curve.
- Count your domains, servers and streams before choosing Basic. Five, five and fifteen respectively, with no inbound email. If any of those is tight, the 10% for Pro is the cheaper answer than working around the limits.
- If you need a dedicated IP, check both gates first. Pro or Platform, and 300,000 emails a month. If you do not clear both, no amount of money buys one here.
Frequently asked questions
How much does Postmark cost?
A free Developer plan covers 100 emails a month permanently. Paid plans start at $15 a month on Basic for 10,000 emails, rising to $55 at 50,000, $115 at 125,000, $245 at 300,000, $455 at 700,000 and $775 at 1.5 million. Pro costs 10% more than Basic at every tier and Platform 20% more. Above 1.5 million emails, pricing is quoted by sales. All figures are US dollars read from postmarkapp.com on 24 August 2026, and there is no annual billing option.
What is the difference between Postmark Basic, Pro and Platform?
Volume is identical on all three; the plan changes the price and the structural limits. Basic gives 5 sending domains, 5 servers, 15 message streams, 4 users, 45-day retention and no inbound email. Pro adds inbound processing, 10 domains, 10 servers, 30 streams, 6 users, retention extendable to 365 days and eligibility for dedicated IPs. Platform makes domains, servers, streams and users unlimited. On price the relationship is fixed: Pro is Basic times 1.10 and Platform is Basic times 1.20, at every volume.
What happens if I exceed my Postmark plan limit?
Sending continues. Postmark states that extra emails are calculated at the end of your billing cycle and added to your plan cost for the following month, so you are billed in arrears rather than blocked. The rate is published per plan: at the lower tiers $1.80 per thousand on Basic, $1.30 on Pro and $1.20 on Platform, improving slightly to $1.70, $1.20 and $1.15 at 1.5 million. Because the in-plan rate falls to about $0.52 per thousand at that volume, overage can cost more than three times what the same emails would cost inside a larger tier.
Do unused Postmark emails roll over?
No. Postmark’s FAQ states that if you are under your email limit at the end of a billing period, the unused emails do not roll over. There is no credit bank and no carry-forward, so a quiet month is simply money spent. Combined with the overage rate, this makes tier choice a genuine decision for anyone with seasonal or unpredictable volume.
Does Postmark offer annual plans or discounts?
Not at present. Asked directly, Postmark says annual plans are something it would like to introduce and invites customers to be notified when they arrive. Every published price is therefore a monthly price with no commitment, no annual discount and no lock-in. Postmark does advertise a bootstrapper offer of $75 in credit toward email costs for bootstrapped startups. Payment is by Visa, MasterCard, American Express, Diners or JCB only; PayPal and purchase orders are not accepted.
How do I get a dedicated IP with Postmark?
Dedicated IPs start at $50 per month per IP, and two conditions apply together: you must be sending at least 300,000 emails a month, and you must be on Pro or higher. Neither alone is sufficient. The practical entry point is Pro at the 300,000-email tier, $269.50 a month, plus the $50 IP charge, so around $319.50 a month in total. The volume requirement is a deliverability policy rather than a pricing one, since a dedicated IP needs steady volume to maintain reputation.
Is there a Postmark plan between 100 and 10,000 emails?
No. Postmark confirms it does not offer a tier between the free Developer plan’s 100 emails a month and the 10,000-email paid tier. A project sending a few hundred emails a month has to buy the 10,000-email plan at $15 and leave most of it unused, which makes that the least efficient point on the whole ladder in terms of emails actually consumed.
Is the Postmark free plan more generous than the Basic plan?
On everything except volume, yes. The free Developer tier allows 30 message streams, 10 servers, 10 custom sending domains, 6 users and inbound email processing. Basic allows 15 streams, 5 servers, 5 domains, 4 users and no inbound email at all. Free matches the Pro plan on each of those limits. The only thing Basic adds over Free is the jump from 100 to 10,000 emails a month, so a developer with an elaborate setup can find that upgrading to the cheapest paid plan actually tightens their limits.
Can I send marketing emails through Postmark?
Yes, but on separate infrastructure. Postmark requires that transactional and marketing mail never mix, and provides Message Streams as parallel but completely separate sending paths for the two. Both draw on the same monthly email allowance and the same price ladder, so there is no second meter or second invoice. Watch the stream limits though: Basic allows 15 streams and Pro 30, shared between your transactional and broadcast streams, which an agency running per-client streams will reach quickly.
How long does Postmark keep message content?
Forty-five days by default on every plan, including Platform. Pro and Platform can extend retention to as much as 365 days through a custom activity retention add-on starting at $5 a month. Basic cannot extend retention at any price, so anyone with a compliance or support requirement for older message bodies needs Pro as a minimum.
Continue reading about Postmark
Pricing is one part of the evaluation. For connection details, ports and authentication for the SMTP service, see the SMTP settings tab. The API tab covers the sending endpoints including the Bulk API, and the integrations tab covers what connects to what. The alternatives tab compares Postmark against the other transactional specialists and against the platforms that bundle marketing and transactional sending together.
Sources. All figures were read from postmarkapp.com on 24 August 2026, in US dollars, with every position on the volume slider read individually rather than interpolated, and the plan comparison table, add-on list and pricing FAQ read in full. Per-thousand rates, the plan multipliers and the overage-versus-in-plan comparisons are our own arithmetic from the published prices. High-volume pricing above 1.5 million emails is not published and we have not estimated it. Prices change; where a figure here disagrees with the vendor’s page, the vendor’s page is correct and we would be glad to be told.
This review follows our email infrastructure testing methodology. We disclose affiliate relationships in our editorial independence policy.
